


Apple Macintosh Internal Floppy disk drive
20 PIN UNKNOWN CONNECTOR
  
    | Pin | Name | Description | 
  
    | 1 | GND | Ground | 
  
    | 2 | PH0 | Phase 0: state control line | 
  
    | 3 | GND | Ground | 
  
    | 4 | PH1 | Phase 1: state control line | 
  
    | 5 | GND | Ground | 
  
    | 6 | PH2 | Phase 2: state control line | 
  
    | 7 | GND | Ground | 
  
    | 8 | PH3 | Phase 3: register write strobe | 
  
    | 9 | +5V | +5 volts | 
  
    | 10 | /WRREQ | Write data request | 
  
    | 11 | +5V | +5 volts | 
  
    | 12 | SEL | Head select | 
  
    | 13 | +12V | +12 volts | 
  
    | 14 | /ENBL | Drive enable | 
  
    | 15 | +12V | +12 volts | 
  
    | 16 | RD | Read data | 
  
    | 17 | +12V | +12 volts | 
  
    | 18 | WR | Write data | 
  
    | 19 | +12V | +12 volts | 
  
    | 20 | n.c. | Not connected | 
  
    | Source: | Apple Power Macintosh 5400 Developer Note | 
  Copyright © The Hardware Book Team 1996-2004.
  May be copied and redistributed, partially or in whole, as appropriate.
  Document last modified: 2002-01-10